The win came after a 15 year battle between the province and the teachers’ union. The battle started in 2002 when the then-Liberal government stripped class size and composition language from collective agreements.

“We know that the language is not set in stone. We know it’s subject to negotiation,” Mooring said.

“But what we are not interested in doing is rolling back student learning conditions.”

Mooring said class size and composition language was negotiated by each local union and so there are some who don’t have it in their agreements.

What the union wants to do during this round is “fill in some of those gaps.”

The #bcpoli government is trying to roll back teachers' Supreme Court win by gutting collective agreement guarantees on class size, class composition, and the number of specialist teachers in #bced. The @bcndp promised better, parents expected better, and kids deserve better. pic.twitter.com/WVgeSXofKv

Mooring said the union never expected to fight about class size and composition with the NDP government, who were critical of how the then-Liberal government handled the dispute during its 16 years in office.

“We didn’t expect that we would be late August without a deal,” she said.

“Education in B.C. is still really underfunded.”

In a statement, the education ministry said it was “encouraging” that the union had agreed to mediation.

“We’re optimistic that the parties will find solutions and reach a deal that works for students, teachers, and everyone in the school system,” the ministry said, noting a $1 billion investment in education, which included 4,000 teachers and 1,000 education assistants.

Mooring lauded the province’s recent capital spending on new schools and seismic upgrades.

What she said they fall short on is operation funding that would help hire enough teachers and make sure they weren’t lured away by higher salaries in other provinces.

“We have a critical teacher shortage in B.C. and the fact that our salary is so low and our cost of living is so high means that we’re not attracting the teachers we need to B.C.,” Mooring said.

Teachers will also be looking for improvements to salary that fall within the government's negotiating mandate. In particular, we want to see the salary grid restructured to address recruitment and retention challenges in #bced. #bcpoli.

She said north central and north coast schools are facing a particularly acute shortage.

“Not all classrooms have certified teachers,” Mooring said.

In urban areas, teacher-on-call lists have been decimated as teachers were hired full-time after the court win.

“Last [school] year, there were hundreds of ‘failures to fill’ every single day in Surrey alone,” Mooring said. That means there were no teachers-on-call to replace absent teachers.

Instead, counsellors, learning support teachers and librarians were pulled in to teach, which means that even if language about class size and composition stays, learning support teachers won’t be in the classroom with their own students.

“Students with special needs get their services denied, they didn’t get the programs they would normally get because their support teacher wasn’t available,” Mooring said, noting a lack of support staff can mean schools ask parents to keep their children home.

Mooring said the fact that B.C. teachers get paid less than their neighbours in Alberta, or other provinces like Ontario, is central to the issue.

While teacher shortages are worst in rural areas, Mooring said, districts like Vancouver are also having trouble filling jobs.

“Very few teachers can afford to live in Vancouver,” Mooring said

“When our [class size and composition] language came back and there were so many opportunities around the entire province, we saw a large amount of teachers leaving the more expensive metro areas for either Vancouver Island or some places in the Okanagan, or the [Fraser] Valley.”